const { MiniProgram, User } = require('../models');
const { Op } = require('sequelize');
const logger = require('../utils/logger');
const config = require('../config');

class MiniProgramService {
  /**
   * 创建小程序
   * @param {Object} data - 小程序数据
   * @returns {Promise<MiniProgram>} - 创建后的小程序
   */
  async createMiniProgram(data) {
    try {
      const miniProgram = await MiniProgram.create(data);
      logger.info(`Mini program created with ID: ${miniProgram.id}`);
      return miniProgram;
    } catch (error) {
      logger.error('Error creating mini program:', error);
      throw error;
    }
  }

  /**
   * 获取小程序
   * @param {Object} filters - 过滤条件
   * @returns {Promise<Array<MiniProgram>>} - 小程序列表
   */
  async getMiniPrograms(filters = {}) {
    try {
      const where = {};
      if (filters.status) {
        where.status = filters.status;
      }
      if (filters.search) {
        where[Op.or] = [
          { name: { [Op.like]: `%${filters.search}%` } },
          { description: { [Op.like]: `%${filters.search}%` } },
          { appId: { [Op.like]: `%${filters.search}%` } }
        ];
      }

      const miniPrograms = await MiniProgram.findAll({
        where,
        attributes: { exclude: ['appSecret'] }
      });
      return miniPrograms;
    } catch (error) {
      logger.error('Error getting mini programs:', error);
      throw error;
    }
  }

  /**
   * 获取小程序
   * @param {number} id - 小程序ID
   * @returns {Promise<MiniProgram>} - 小程序
   */
  async getMiniProgramById(id) {
    try {
      const miniProgram = await MiniProgram.findByPk(id, {
        attributes: { exclude: ['appSecret'] }
      });
      if (!miniProgram) {
        throw new Error('Mini program not found');
      }
      return miniProgram;
    } catch (error) {
      logger.error(`Error getting mini program with ID ${id}:`, error);
      throw error;
    }
  }

  /**
   * 更新小程序
   * @param {number} id - 小程序ID
   * @param {Object} data - 更新数据
   * @returns {Promise<MiniProgram>} - 更新后的小程序
   */
  async updateMiniProgram(id, data) {
    try {
      const miniProgram = await this.getMiniProgramById(id);
      await miniProgram.update(data);
      logger.info(`Mini program ${id} updated successfully`);
      return miniProgram;
    } catch (error) {
      logger.error(`Error updating mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 删除小程序
   * @param {number} id - 小程序ID
   * @returns {Promise<boolean>} - 删除结果
   */
  async deleteMiniProgram(id) {
    try {
      const miniProgram = await this.getMiniProgramById(id);
      await miniProgram.destroy();
      logger.info(`Mini program ${id} deleted successfully`);
      return true;
    } catch (error) {
      logger.error(`Error deleting mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 更新小程序状态
   * @param {number} id - 小程序ID
   * @param {string} status - 状态
   * @returns {Promise<MiniProgram>} - 更新后的小程序
   */
  async updateMiniProgramStatus(id, status) {
    try {
      const miniProgram = await this.getMiniProgramById(id);
      await miniProgram.update({ status });
      logger.info(`Mini program ${id} status updated to ${status}`);
      return miniProgram;
    } catch (error) {
      logger.error(`Error updating mini program ${id} status:`, error);
      throw error;
    }
  }

  /**
   * 更新小程序二维码
   * @param {number} id - 小程序ID
   * @param {Array<Object>} qrCodes - 二维码数据
   * @returns {Promise<MiniProgram>} - 更新后的小程序
   */
  async updateQRCodes(id, qrCodes) {
    try {
      const miniProgram = await this.getMiniProgramById(id);
      await miniProgram.update({ qrCodes });
      logger.info(`Mini program ${id} QR codes updated successfully`);
      return miniProgram;
    } catch (error) {
      logger.error(`Error updating mini program ${id} QR codes:`, error);
      throw error;
    }
  }

  /**
   * 更新小程序统计数据
   * @param {number} id - 小程序ID
   * @param {Object} statistics - 统计数据
   * @returns {Promise<MiniProgram>} - 更新后的小程序
   */
  async updateStatistics(id, statistics) {
    try {
      const miniProgram = await this.getMiniProgramById(id);
      await miniProgram.update({ statistics });
      logger.info(`Mini program ${id} statistics updated successfully`);
      return miniProgram;
    } catch (error) {
      logger.error(`Error updating mini program ${id} statistics:`, error);
      throw error;
    }
  }

  /**
   * 分配用户到小程序
   * @param {number} id - 小程序ID
   * @param {number} userId - 用户ID
   * @returns {Promise<boolean>} - 分配结果
   */
  async assignUser(id, userId) {
    try {
      const miniProgram = await this.getMiniProgramById(id);
      await miniProgram.addUser(userId);
      logger.info(`User ${userId} assigned to mini program ${id}`);
      return true;
    } catch (error) {
      logger.error(`Error assigning user ${userId} to mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 移除用户从小程序
   * @param {number} id - 小程序ID
   * @param {number} userId - 用户ID
   * @returns {Promise<boolean>} - 移除结果
   */
  async removeUser(id, userId) {
    try {
      const miniProgram = await this.getMiniProgramById(id);
      await miniProgram.removeUser(userId);
      logger.info(`User ${userId} removed from mini program ${id}`);
      return true;
    } catch (error) {
      logger.error(`Error removing user ${userId} from mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 获取小程序用户
   * @param {number} id - 小程序ID
   * @param {number} page - 页码
   * @param {number} limit - 每页数量
   * @returns {Promise<Object>} - 用户列表和分页信息
   */
  async getMiniProgramUsers(id, page = 1, limit = 10) {
    try {
      const offset = (page - 1) * limit;
      const miniProgram = await this.getMiniProgramById(id);
      const users = await miniProgram.getUsers({
        attributes: ['id', 'name', 'email', 'phone'],
        limit,
        offset
      });

      const total = await miniProgram.countUsers();

      return {
        users,
        total,
        page,
        totalPages: Math.ceil(total / limit)
      };
    } catch (error) {
      logger.error(`Error getting users for mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 验证小程序访问权限
   * @param {number} id - 小程序ID
   * @param {number} userId - 用户ID
   * @returns {Promise<boolean>} - 访问权限
   */
  async validateMiniProgramAccess(id, userId) {
    try {
      const miniProgram = await this.getMiniProgramById(id);
      const hasAccess = await miniProgram.hasUser(userId);
      return hasAccess;
    } catch (error) {
      logger.error(`Error validating mini program ${id} access for user ${userId}:`, error);
      throw error;
    }
  }

  /**
   * 获取小程序访问令牌
   * @param {number} id - 小程序ID
   * @returns {Promise<string>} - 访问令牌
   */
  async getAccessToken(id) {
    try {
      const miniProgram = await MiniProgram.findByPk(id, {
        attributes: ['appId', 'appSecret']
      });

      if (!miniProgram) {
        throw new Error('Mini program not found');
      }

      // Implement WeChat access token retrieval logic
      throw new Error('Not implemented');
    } catch (error) {
      logger.error(`Error getting access token for mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 小程序登录
   * @param {number} id - 小程序ID
   * @param {string} code - 登录code
   * @returns {Promise<Object>} - 登录结果
   */
  async code2Session(id, code) {
    try {
      const miniProgram = await MiniProgram.findByPk(id, {
        attributes: ['appId', 'appSecret']
      });

      if (!miniProgram) {
        throw new Error('Mini program not found');
      }

      // Implement WeChat code2Session logic
      throw new Error('Not implemented');
    } catch (error) {
      logger.error(`Error exchanging code for session for mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 生成小程序URL链接
   * @param {number} id - 小程序ID
   * @param {string} path - 路径
   * @param {Object} query - 查询参数
   * @returns {Promise<string>} - URL链接
   */
  async generateUrlLink(id, path, query) {
    try {
      const miniProgram = await MiniProgram.findByPk(id, {
        attributes: ['appId', 'appSecret']
      });

      if (!miniProgram) {
        throw new Error('Mini program not found');
      }

      // Implement WeChat URL Link generation logic
      throw new Error('Not implemented');
    } catch (error) {
      logger.error(`Error generating URL link for mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 获取小程序无限制二维码
   * @param {number} id - 小程序ID
   * @param {string} scene - 场景
   * @param {string} page - 页面
   * @returns {Promise<string>} - 二维码
   */
  async getUnlimitedQRCode(id, scene, page) {
    try {
      const miniProgram = await MiniProgram.findByPk(id, {
        attributes: ['appId', 'appSecret']
      });

      if (!miniProgram) {
        throw new Error('Mini program not found');
      }

      // Implement WeChat unlimited QR code generation logic
      throw new Error('Not implemented');
    } catch (error) {
      logger.error(`Error generating unlimited QR code for mini program ${id}:`, error);
      throw error;
    }
  }

  /**
   * 发送订阅消息
   * @param {number} id - 小程序ID
   * @param {string} toUser - 接收者
   * @param {string} templateId - 模板ID
   * @param {Object} data - 数据
   * @returns {Promise<boolean>} - 发送结果
   */
  async sendSubscribeMessage(id, toUser, templateId, data) {
    try {
      const miniProgram = await MiniProgram.findByPk(id, {
        attributes: ['appId', 'appSecret']
      });

      if (!miniProgram) {
        throw new Error('Mini program not found');
      }

      // Implement WeChat subscribe message sending logic
      throw new Error('Not implemented');
    } catch (error) {
      logger.error(`Error sending subscribe message for mini program ${id}:`, error);
      throw error;
    }
  }
}

module.exports = new MiniProgramService(); 